Variable-capacity pump.



BV V. NORDBERG.

VARIABLE CAPACITY PUMP.

APPLICATION FILED JAN. 21, 1909.

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VARIABLE CAPACITY PUMP,

APPLIGATION FILED JAN. 21, 1909.

Patented July 16, 1912.

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B. V. NORDBERG.

VARIABLE CAPACITY PUMP.

APPLICATION FILED IAN. 21, 1909.

Patented July 16, 1912.

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B. V. NGRDBERG.

VARIABLE CAPACITY PUMP.

APPLICATION FILED JAN. 21, 1909.

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VARIABLE-CAPACITY PUMP.

To all 'whom 'it'may concern:

Be it known that I, BRUNO V. NORPBERG, a citizen of the United States, residing at 'Milwaukee in the county of Milwaukee and accompanying drawing, fforming a part thereof.

This invention relates more part1cularly to pumps actuated byv substantially const-ant speed -motors a-nd designed to operate upon inelastic fluids or liquids such as water, under varying demands. Its main objects are to vary the capacityy of such a pump and the consumption of power required for its operation according to variations in theV demand upon it without changing its speed; hence to econoniize power, and generally to improve the construction and operation of pumps of this class.

It consistsv in the construction, arrangef ment and combination 4o'f parts as herein` after particularly described and claimed.

In the accompanying drawing like characters designate the same parts in the sev# eral figures. i Figure 1 is a vertical longitudinal section of a pump embodying the invention; Fig. 2 is an enlarged end view as' seenfrom the left with relation to Fig. 1 of the valve mechanism controllingthe operation of the hydraulic motor; Fi 3 is an enlarged side elevation as viewed om'the right with relation to Fig. 2 of such mechanism; Fig.` 4 is an inverted horizontal section on a still larger scale of a part of the valve mechanism, the plane of the section and the Vdirection of view being indicated by the dotted line 4 4 and arrows on Fig. 2; Fig. 5 is a verticalsection on the line 5 5, Figs. 4 and 6;- Fig. 6 is a vertical cross section on the line 6 6, Figs. 4, 5, 7 and 8; Fig. 7 is a section on the line 7 7, Fig. 6; Fig. 8 is a c'orresponding section on the line 8 8, Fig. 6; Fig. 9 is a section onv the line 9 9, Fig. 6; Fig. '10 1s a similar but inverted section `on `the line 10 1,Fig. 6; and Fig. 11 is a `horizontal section on the line 1 1-11, Fig. l.

Referring to Fig. l, which for the pur- Specication of Letters Patent.

Application filed January 21, 1909. Serial N9. 473,416.

Patented July 16, 1912.

pose of illustration shows a part of a center-packed duplex plunger pump, although' the invention is Vequally applicable to and may be elnbodied in other kinds of pumps, a designates the pump cylinder, in the present case made in two parts or sections which are provided with suitable suction and discharge valves (not shown), 5 a reciprocating plunger working through stuffing boxes in the inner ends of the cylinder sections, c a rotary shaft provided with a driving 'crank or eccentric d for each plunger b, and e a countershaftfrom which in the present instance, the crank shaft is4 driven through a pinion f, indicated by a dotted line, and a gear g. y

`The plunger b has an adjustable power transmitting connection with the crank or eccentric d for varying the stroke of the plunger in accordance with variations in the load or demand upon the pump. Such connection consists of a pitman or rod L connected at one end with the crank d and at the other end with links i and j which are rocker or adjustable fulcrum support Z respectively. In the presentcase the rocker consists of a pair of triangular arms corresponding in length on one side withthe links z' and j and each provided at its upper angle with a horizontal pin or journal m by which they arepivotally connected with the pump frame. To balance the driving connections of the plunger and to evenly distribute the strains,- the links and j are duplicated and arranged on both sides of the pitman h and cross head-lc, the links j being pivoted at their lower ends to the inner sides of the rocker arms,-w hich may be connected, with each other by cross rods lZ' or otherwise.

The construction and arrangement of the lpartsare such that whenthe plunger b is at mid stroke the pivot n between the pitman h and the links i and j will be in line with the pivots m of the rocker Z, and when the pivots o between the links j and the rocker Zare brought into line with the pivot p lbetween the links z' and the cross head c,`

the plunger Z7 will remain motionless while the driving crank d continues to turn.

For adjusting4 the :rocker l. tov vary the stroke of the plunger'as required, a motor is provided. For this purpose a. hydraulic motor comprising`l a cylinder g and reciprocating piston fr is shown, the cylinder beconnected on each side by a link or rod ing made in two parts and the piston, which is of the center-packed plunger type,'work ing through glands in the inner ends of the cylinder .sections and provided in the spacebetween them with a cross head s which is with the rocker Z at theV outer lower angles of its arms, as shown in Fig. 11. A motor- -operated by inelastic' iiuid is employed, m

order that in the adjust-ment of the rocker its movement and position may be predetermined with accuracy, a result diiiicult if not impossible to attain with a direct con- The outer ends of theV motor cylinderg are connected -by pipes u and fv, as shown in Figs. 1 and 11, with passages w and m, in a valve casey, as shown in Figs 5, 7, 8, 9 andJv .with a stemextendin'g therefrom on bot-h Asides yand terminating in plungers or pistons 8 which iit: and work 'in stuiiing boxes or glands at the ends'of the associated bushing. The plungers 8 correspond in cross section with the area'of the ports, and hence balance the valves.

l As shown inFigs. 2, 4,A 6, 8 9 and 10, a

liquid supply pipe 9 communicates through a branchingpassage 10 withvthe chambers' of thevalves2 `and 3. Liquid vunder suiiicient pressure or head for operating the motor, may be supplied by the pump whose action is regulated by the motor, ormay be' taken from any other available source.

As. shown inFigs. 2, 3, 4, 7, 9 and 10,- an exhaust pipe 11 leads from a branchingy passage 12 which communicates with the'cham bers 6 of the valves 4 and 5 on the opposite side of the case y.

As shown in Flgs. 6, 7, 8- and 9, the passi.

sage Iw communicatesthrough branches with the chambers 7 of theadmission valve 2 andVV of the -exhaust valve 4,v and as shown in'l l Figs. 6, 7, Band 10, -the passage a: communicates through branches withthe chambers 7' of the admission valve 3 and of the exhaust valve '5.

As shown in Figs. 2, 3, 4, 5', 9 and 10,.a1:

their outer ends or the ends toward which the valves open, t-hel stems of the'valves 4 and4v 14. yThese levers are connected as shown in Figs. 2 and 4, by sliding ball and socket joints at one end with the stems of the. valves2 and 3,A and at the other en d 'with la vertical lever 15, having a fixed fuln erum 16 midway between them. Midway between the stems of the valves 2 and 3 onv the one hand and 4 and 5 on the other hand, the levers 13 and 14 are pivotally connected with a vertical l bar 17, as shown in Figs. 4 and 5, and midway between said levers the bar 17 is connected by a horizontal rod 18 with a spring 19 inclosed in a recess of the valve case y andtending to close the v'several valves 2, 3, 4 and 5 and to hold them against their seats.

As shown in Figs. 1,- 2 and 3, the lever 15 is 'connected at its upper end by a link 2() with the lower end of a floating lever 21, which is pivoted in andcarried by a twoarmed rocker 22, pivotally mounted on the valve ease The upper end of the lever 21 isconnected by a link 23 with an arm ofv the rocker l. A two-armed rocker 24 mounted in a stand 25 on the ump frame, has one'of its arms connected ya link 26 with the floating lever 21betw'een'its upper end and its connection with the rocker 22, while the other arm may serve as a crank or handle for manually operating the iioating lever 21, or may be connected as shown in Figs. 1 and 3, by a rod 27 with a float, piston or other device (not shown) actuated by variations in. the head or pressure produced by the pump for automatically imparting the initial movement to the floating lever 21.

In -duplex pumps or pumps having two or morel plungers which may-be actuated by cranks or eccentrics on a common driving shaft, a number of rockers or adjustable fulcrum supports Z may be operatedA by'a single motor, or by a number of motors, one for each rocker, under the control of a single group of valves like that shown, with i branch pipes leading from the pipes u and 'v to thevcylinde'rs q of the several-motors.

The pump herein shown anddescribed operates as follows A In Fig; 1 the rocker Z 1s shown as adjusted for producing a full stroke of the plunger b, so that the pump will operate at .'its maximum capacity. -If under these conditions, the head or pressure produced by the pump is increased on rac. y'

count of a diminished demand, the rocker arms 24 willbe turned to the rightyas indicated'byV a dotted linein Fig. 3, by the iioat 'the connection 27."l `The floating lever 21 turning on the pivot connection at its upper end with' the link 23 as a fulcrum, will also be swungY to the-right, as indicated by .the

or'other" automatic device actng through Y dotted line 28, Fig-3. This movement ot the ,lever 21 will swing the lever 15 to the right, as indicated by the dotted' line on the same figure, thereby rocking the levers 13 and 14 in opposite directions. The upper lever 13 turning on its pivot connection With t-lie stem of valve 4 as a ulcrum, Will lift the admission valve 2 from its seat, as shown in Figs. 8 and 9, thereby admitting fluid un# der pressure from the supply pipe 9 through the passagevlO and the chambers 6 and 7 of kthe valve 2, into the passage w, and thence by the pipe u into the'left end of the motor cylinder g. At the same time the loWer lever 14' turning on its pivot connection with t-he stem of valve 3 as a fulcrum, Will lift the exhaust valve 5 from its seat, as shown in Fi s. 7 and 10, releasing the liquid confined in t ic right end of the motor cylinder g through the pipe lv, passage a', chambers 6 and 7 of the valve 5, and passage 12, into the exhaust pipe 11. The motor piston r will thus be `moved to the right a distance corresponding with the initial movement of the rocker 24, and with the volume of liquid thus admitted through the pipe u'into the left end of the cylinder 2. The rocker l will be turned on its pivots m toward t-he links i, carrying the pivots 0 of the links j toward the pivot p of the links z, and correspondingly shortening the. stroke-of the plunger b. This Will obviously reduce' the volume of liquidv delivered by the pumpwhile the crank shaft c continues to rotate at a constant speed. The movement of the rocker Z tothe right as above stated, acts through the link 23 to turn the oating lever 21 on its pivot connection with the link 26 as a fulcrum, to the right into the position `indicated by the dotted line 29, Fig. 3, thereby turning the lever 15 back to its original -position as shown by full lines in Figs. .land 3, and closing the valves 2 and 5. Further admission and release of' liquid from the motor cylinder being thus cut off, the piston :r'will beheld in the posi-Y tion to which it is moved as above stated, andthe pump willV continue to operate with a shorter'stroke and diminished capacity until a .further variation in the head or pres-Y toward the links z' an interval corresponding With the initial movement of the rocker 24, thus further shortening the stroke. of the plunger b and reducing the capacity of the pump While the crank shaft c continues to rotate at its normal speed.v In case of-increased demand upon the pump and a consequent :lowering'ofthe head yor pressure, the rocker arms 24 will be turned to the left and the operations hereinbefore described will be reversed, the lower admission valve 3' and the upper exhaust valve 4 being opened, adl `mitting liquid under pressure through the ythe pump and consequent variations in the head or pressure from full stroke or capacity to Zero, and vice versa.

The rocker 24 may be turned by hand, to- Vary the capacity of the pump, and in that case the floating lever 21 Will operate automatically as explained, to close the valves piston lr'. v 4

Various modifications in the construction driving crank, of an adjustable ulcrum support, a pitmaii connected at one end with said crank and links of the same length pivotally connected together at one end with.

`the other end of said pitman and at their opposite ends with said plunger and fulcrum Support respectively, the pivot connection between the fulcrum support and one link being movable intol and out of line with thev pivo-t connection between theA plunger and the other link. v

2. In a variable capacity pump the combination with a reciprocating plunger and va rotary driving shaft, of an adjustable actu'-l ating connection between said .plunger and shaft, a motor for changing the adjustment of said actuating connection to vary the stroke ofthe plunger, and means controlling the operation of said motor comprising a floating lever connected with a part actuated .which con-trol the operation of the motor land arrangement of parts maybemade in r thereby and adapted to automatically stop the motor according to the extent of ythe initial movement of said controlling means., 3. In a variable capacity pump. the combination with a" reciprocating plunger and a driving crank, of va movable fulcrum support, a pitman connected at one end with said crank, links ofthe same. length piv otally connected 'togetherat one end with the other end of the pitman and at their-op# posite ends with said plunger and fulcrum support respectively, lthe pivot connection, between ythe fulcrum support and one link being movable` into and-out of line with the i pivot connection between the plunger and the other link, `a motor yconnected with and adaptedto shift said ulcrum support, and

vmeans for controlling the operation .of said motor. v

and 'at the opposite vend to said rody in line with' its pivoted connection with saidlinks,

the .pivot between said 'rod and links being movable into and out of line with the pivot c bearings of the rocker and the pivots between the links and rocker arms-being movable into and out of line with thel pivot between the link connection and plunger.

5.' In a' variable capacity pump the `combination with a reciprocating plunger and a driving crank, ofa rocker pivoted to the pump trame, Ia pitman connected at one end with said crank, and links of the same length` pivoted at one end to theother' end of the pitmanandv at their opposite ends to the plunger and rocker respectively, the' pivot connection between. said rocker and one link being movable into and out of line with 'the pivot connection. between the plunger and the otherglink.

' 6. In a variable'capacity pump the com-y binat-ion with a reciprocating plunger and a driving crank, of a .rocker pivoted to the pumpframe,- links of the same length pivotally connected at one` end with the rocker and plunger respectively, a pit-man connecting said links lat their opposite ends with said crank, the pivo-t connection between lthe rocker and one link-being movable into and out of line with the pivot connection between the plunger and the other link, a motor connecte'd with and adapted 'to swing said rocker in opposite directions, and means for reversing and controlling the operation of said motor. c

'- 7. In a variable capacity pump the combination with a reciprocatingplunger and a driving crank, of `a rocker pivoted to the pump frame, linksof the same length pivoted at one end to the rocker and plunger respectively, a pitman connecting said links at the opposite ends with said crank, a motor connected with said rocker and adapted to swingv it in opposite directions, and

mechanism for controlling the .operation of said motor comprising a iioating lever connected with said rocker. y l Y 8. In a variable capacity pump the combination with a driving crank and a reciprocating plunger, a pitman connected at one end with said crank, a rocker arm pivoted to thepump frame, andlinks of the same length as the rocker arm pivoted together at one end to the other end of the pitman and attheir opposite ends to the rocker arm and plunger respectively, the pivot between the pitman and the links being in line with the pivot' between the rocker and frame when 'the plunger is at' mid stroke, and the pivot between the, rocker and oneY link being movlable into line with the pivot between the plunger and the other link to renderthe plunger motionless While the crank revolves. 9.(In a variable capacity pump the combination with a rotary driving-shaft and a reciprocating pump plunger, lof an adjustable powerftransmitting connection between said lshaft and plunger, a f hydraulic motor for. adusting'said connection, liquid supply and .exhaust connections with said motor, balanced admission and exhaust valves con; trolling said liquid connections and arranged. in pairs, parallel levers each con- 85 vnected witha pair of admission and exhaust valves, either of each pair of valves serving as a 'fulcrum for opening the other, a transverse lever'fulcrumedbetween andA connectedwithsaid ftransverse levers and adapted when turned .in one direction to open one Aot' the' ya'dmissi on andl one offthe exhaustvalves and when turned in the opposite direction 'to open theother admission and the other exhaust valve, and a spring connected wlth 'said parallel levers between their connections with said valves `and tending to close all of Vthe valves.

"10; In a variable capaci/ty pump the combination with a rotary driving shaft and a pump plunger, of an adjustable power transmitting connection between said shaft and plunger, a hydraulic motor for adjusting said connection to vary the stroke of the plunger, Huid pressure supply and exhaust 105 'connections with said motor, admission and exhaust valves controlling said iuidconnections, valve operating mechanism comprising ya floating lever adapted when moved in' one direction from: a neutraliposltion to 110 open one pairof admission and exhaust valvesand when moved in the opposite direction'ffrom a neutral position-to open the other pair of valves, and a connection with said motor adapted to automatically move 115 said lever to a neutral position afterinitial movement thereof by other means.'

1l. In a variable capacity pump the combination with a drivingcrank and a pump plunger, of a rockerpivoted to the pump 120 frame, links connected at one end with said plunger and rocker respectively, a pit1 nan "connecting the opposite ends of said llnks with the,A driving crank, a hydraulic motor connected with said rocker and having fluid 125 pressure supply and exhaust connections, admission and exhaustvalves controlling said fluid connections, yielding means tending to close said valves, levers arranged when moved in one direction to, open one pair of admission and exhaust valves and when moved in the other direction to open the other pair, a floating lever Connected With said valve operating levers and with said motor, and means connected with said floating lever for initially moving it in either clii'eetion from a neutral position.

In Witness whereof. I hereto affix my signature .in presence of two Witnesses.

BRUNO V. N ORDBERG.

Witnesses:

CMAS. Goss, FRANK E. BENNETT. 

